Idaho · Historical growing seasons
Every season has
a little history.
Explore a historical outlook for the next planning season, the last freeze of spring, the first freeze of fall, and the days in between. A local record to help put your growing season in perspective.
The local record
Planning-year historical outlook
Planning context, not a guarantee. This projection repeats the historical distribution for the displayed planning year. It does not include current soil conditions, recent weather, or a seasonal forecast model.
Selected archive season
Use the year control above to inspect an observed historical season.
What supports the typical dates
The historical baseline
Date ranges describe confirmed events only. Complete years without an event, incomplete windows, and years without valid minima are excluded from date statistics. These counts describe this archive, not the probability of a freeze in a future year.
| Window / baseline | Typical / P10–P90 | Observed extremes | Confirmed years | Other baseline years |
|---|
Patterns across the years
Freeze-date history
Confirmed dates by year. Shaded bands show the historical P10–P90 range; dashed lines mark the typical date (P50).
View the accessible history table
| Year | Last spring freeze | First fall freeze | Verified frost-free days |
|---|
Behind the dates
Season details
| Window | Result | Event minimum | Daily coverage | Provisional candidate |
|---|
A note from the field
History offers context.
It doesn’t promise a date.
The planning-year projection uses the historical P50 as its central date and P10–P90 as its historical range. Spring P90 is a later last-freeze date; fall P10 is an earlier first-freeze date. This is a climatology baseline, not a model forecast or a probability guarantee.